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Note 6 - Aemetis Biogas LLC, Series A Preferred Financing and Variable Interest Entity (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Jan. 01, 2023
Aug. 08, 2022
Dec. 20, 2018
Mar. 31, 2021
Dec. 31, 2022
Dec. 31, 2021
Series A Preferred Unit, Current         $ 0 $ 3,200
Financial Instruments Subject to Mandatory Redemption, Settlement Terms, Share Value, Amount, Noncurrent         116,000 45,000
Total Assets of ABGL Company         79,800  
Series A Preferred Units Value         $ 116,000  
Carbon Revolving Line [Member]            
Extinguishment of Debt, Gain (Loss), Net of Tax   $ (49,400)        
Preferred Units Series A [Member]            
Common Units Authorized (in shares)     11,000,000      
Common Units Issued (in shares)     6,000,000      
Preferred Unit Dividend Rate Per Dollar Amount (in dollars per share)     $ 0.50      
Conversion of Stock, Shares Issued (in shares)     1,200,000   5,000,000  
Maximum Number of Shares (in shares)     5,000,000      
Redeemable Noncontrolling Interest, Equity, Preferred, Redemption Value per Unit (in dollars per share)     $ 15      
Free Cash Flow Generated by ABGL     75.00%   100.00%  
Redeemable Noncontrolling Interest Equity Redemption Value, Total     $ 90,000      
Fees and Commission Transfer Agent     900      
Debt Instrument, Collateral Amount     $ 30,000,000      
Preferred Units Issued Value           $ 3,100
Preferred Units, Issued (in shares)           626,000
Preferred Units Redeemed, Value         $ 116,000  
Preferred Units, Initial Fair Value   105,800        
Preferred Units Series A [Member] | First Tranche [Member]            
Preferred Units Issued Value         $ 16,000  
Preferred Units, Issued (in shares)         3,200,000  
Preferred Units Series A [Member] | Second Tranche [Member            
Preferred Units Issued Value         $ 14,000  
Preferred Units, Issued (in shares)         2,800,000  
Stock Redeemed or Called During Period, Shares (in shares)         20,000  
Preferred Units Redeemed, Value       $ 300   $ 300
Preferred Units Redeemed (in shares)           20,000
Series A Preferred Stocks [Member]            
Common Units Issued (in shares)     6,000,000      
Common Units Issuance Value (in dollars per share)     $ 5.00      
Proceeds from Issuance of Common Units     $ 30,000,000      
Preferred Units Reserved for Future Issuance (in shares)     5,000,000      
Preferred Units Series A Redeemable By December 31, 2022 [Member] | ABGL [Member]            
Preferred Units Issued Value   116,000        
Preferred Units Series A Redeemable By December 31, 2022 [Member] | ABGL [Member] | Subsequent Event [Member]            
Preferred Units Issued Value $ 125,000          
Preferred Units Series A Redeemable By September 30, 2022 [Member] | ABGL [Member]            
Preferred Units Issued Value   $ 106,000